![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/7/73/25_solar_system_objects_smaller_than_Earth.jpg/640px-25_solar_system_objects_smaller_than_Earth.jpg&w=640&q=50)
Planetary-mass object
Size-based definition of celestial objects / From Wikipedia, the free encyclopedia
Not to be confused with Planet.
A planetary-mass object (PMO), planemo,[2] or planetary body is, by geophysical definition of celestial objects, any celestial object massive enough to achieve hydrostatic equilibrium, but not enough to sustain core fusion like a star.[3][4]
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/7/73/25_solar_system_objects_smaller_than_Earth.jpg/640px-25_solar_system_objects_smaller_than_Earth.jpg)
The purpose of this term is to classify together a broader range of celestial objects than 'planet', since many objects similar in geophysical terms do not conform to conventional expectations for a planet. Planetary-mass objects can be quite diverse in origin and location. They include planets, dwarf planets, planetary-mass satellites and free-floating planets, which may have been ejected from a system (rogue planets) or formed through cloud-collapse rather than accretion (sub-brown dwarfs).